Absolutely you should be mad that people who were unfit to the job had the job, but don't fall into the trap of blaming their being female for them being unfit.
Working in the E.R on a (nearly) daily basis I agree 100% with this, I have seen more than a few scrawny and "weak" (physically) men, both on the table, and working alongside me to treat the patient on the table.
Let me ask you this Aramax, if the two paramedics that arrived to put you on a stretcher turned out to be short, under muscled men (or fat un-muscled ones) would you then have a bias against men being in the field?
I think at the root of it you don't have an issue with women per se, but actually have an issue with people who aren't physically capable of doing a job being allowed by society/their boss/circumstance, to be in a position to do it anyway, and often, doing it poorly which can (and often does) put other peoples lives at risk. I can agree with you completely that those without the right physical fitness to perform a job shouldn't, and the mandatory yearly physical fitness exams for such jobs need to be rigidly enforced for the safety of all concerned.